How to raise my lactic acid endurance please answer?

well......nothing you can drink or eat but u can build endurance by running hills on a golf course. i had some problems when i ran for cross counrty which is basically running strait and nothing else. the first time i sucked. this one girl made fun of me and i ran with a friend (shes very fit) and ran the hills together. when it came to practice i was one of the fastest kids there.